Luke Shaw will be allowed to leave Old Trafford in 2018 if a club comes in with an offer in excess of £20million.

He is currently on a contract worth £130,000 a week and that will need to be covered by whoever makes a move for the 22-year-old.

Manchester United made the left-back the most expensive teenager in the history of football in 2014 when they signed him from Southampton for £28million.

That title has since been taken by two former Monaco youngsters, his squad mate Anthony Martial and Kylian Mbappe who will become a permanent member of the Paris Saint-Germain dressing room in 2018 for £165.7million.

Shaw was supposed to be the long-term successor to Patrice Evra, with United's spending big on a player with the potential to hold down a spot in their team for at least a decade.

Luke Shaw is out of contract in 18 months time (Image: OLI SCARFF/AFP/Getty Images)

It was a move predicated on the same logic that saw the club break transfer records to sign Rio Ferdinand and Wayne Rooney during the reign of Sir Alex Ferguson.

However, major injuries and difficulties with his managers have seen the 22-year-old fail to realise his potential at Old Trafford, leading to talk of an early exit for the defender.

United want to recoup as much value as they can from any sale and have triggered a clause in the youngster's contract to automatically extend his deal into 2019, to strengthen their negotiating position.

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Tottenham Hotspur manager Mauricio Pochettino handed Shaw his debut at Southampton and the pair enjoyed a close working relationship, in stark contrast to the friction he has endured while playing under Louis van Gaal and Jose Mourinho.

He would be welcomed into Argentinian's squad at Spurs if the right deal can be agreed but Arsenal and Chelsea also maintain an interest in his services, according to the Telegraph.

Outside of London, Everton and Manchester City could offer him other options in the north west if he decided against moving away.

United are only willing to consider offers above £20million for the once highly-rated full-back and with Marcos Alonso currently the only specialist left-back on the books at Stamford Bridge, Antonio Conte could be tempted to instruct his directors to open talks.

Chelsea were keen to sign Shaw during Jose Mourinho's second season back in charge in 2014 only to lose out to their rivals despite the player having grown as a fan of the club.